Steam engine



Sept. 14 1926.

L. PIRO STEAMENGINE Filed Oct, 18,

ATTORNEY Patented Sept. 14, 1926.

LOUIS PIRO, 0F PHILADELPHIA, PENNSYLVANIA.

STEAM ENGINE.

Application led October 18, 1924. Serial No. 744,443.

rlhis invention relates to steam engines, and more particularly to steam engines designed for use in connection with locomotives, the object of the invention being to provide a compound cylinder drive which will provide a constant, increased application of power to the driving wheels of the locomotive, thereby materially increasing the pulling power of the locomotive without materially increasing the consumption of the energizing fuel or fluid.

Other object-s of the invention will appear in the following detail descriptiom'and in the accompanying drawings wherein:

The figure is a fragmentary side elevation of a locomotive, showing the improved cylinder structure in section.

Referring more particularly to the drawings, the locomotive indicated at 1 may be of any approved type, and it is provided with a pair of longitudinally extending steam mains or delivery pipes 2 along each side thereof which receive the steam or motive power from the boiler of the locomotive, and deliver it to the cylinders or engines. The cylinders or engine structures are positioned on each side of the locomotive and are similar in construction, so that only one set will be illustrated and described.

The cylinder or engine drive comprises the cylinders 3 and 1, which are identical in bore and are disposed in endwise alignment, one with the other. The pistons 5 and 6 are mounted for reciprocatory movement in the cylinders 3 and 4 respectively, and they are connected by suitable piston rods 7 and 8, to each other and to the cross head 9. The steam is delivered to the cylinders 3 and 4: for reciprocating the pistons 5 and 6 through valve structures 10 and 11, respectively, each of which have communication through suitable pipes 12 of equal transverse area and capacity with the steam supply pipe 2. The valve structures 10 and 11 include the horizontally aligned piston valves 13, each of which comprise end heads of the same diameter, each connected by a reduced neck, which reciprocate within the steam chests 14, which are disconnected from each other, as are the cylinders 3 and 4, it i being apparent that the steam inlet branch pipes 12 discharge into their respective steam chests at a point intermediate the heads of the respective piston valves. The pistonvalves are each of the same diameter and are connected for unitary movement by trie common valve rod 16, and they are operated from the cross head 9 by the operating mechanism 17 of any approved type now 1n use. Y

It is, of course, to be understood, that the invention may be constructed in various other manners and the parts associated in diferent relations, and therefore, I do not desire to be limited in any manner, except as set forth in the claims hereunto appended.

What I claim is In a railroad locomotive of the character described, a plurality of disconnected engine cylinders having the same bore, and arranged in horizontal alignment, pistons in said cylinders, a common piston rod secured to said pistons, and having a rearward extension, a cross head to which the rearward extension of said piston rod is secured, a plurality of disconnected steam chests, ycarried by said cylinders, aligning piston valves in said steam chests, a single valve rod common to said piston valves, each of the latter having end heads and a reduced neck connecting said heads, a steam supply main, a plurality of branches of substantially the same cross sectional area as said main, discharging directly into the central portion of said steam chests into the space between the heads of each of said piston valves, means for actuating said valves, a plurality of driving wheels, a crank pin on each of said driving wheels, a connecting rod common to said cross head and one of said crank pins, and a connecting bar connecting each of said crank pins.

In testimony whereof I aiiiX my signature.

LOUIS PIRO. 

